Reproduction

Question 1

During ejaculation, ____ sperm are ejected into the vagina, but ____ due to leakage, destruction, or Inability to penetrate the mucus of the cervix.

Answer 1

Several hundred million;

Most are lost

Question 2

In order to be fertilized, the secondary oocyte must encounter a sperm within ____ of ovulation. (Sperm can live in the female reproductive tract for up to ____).

Answer 2

12 to 24 hours;

1 to 3 days.

Question 3

The secondary oocyte is protected by two structures, a cluster of cells called the ____ and a clear glycoprotein coat called the ____.

Answer 3

Corina radiata;

Zona pellucida.

Question 4

To penetrate the egg, the acrosome of sperm must ____ to release ____. To prevent early release, each sperms acrosome is inactive until ____.

Answer 4

Rupture;
Digestive enzymes;
Long after it enters the vagina.

Question 5

The acrosomes of sperm cannot rupture until they are exposed for several hours to fluids in the vagina, uterus, and Fallopian tubes. This preparation of the acrosome for use is called ____.

Answer 5

Capacitation.

Question 6

Only one sperm will actually fertilize the egg, but that one sperm needs the help of many others in order to ____ so that it can reach the egg. Essentially, the eggs defense fail when stacked by hundreds of sperm.

Answer 6

Dissolve the zona pellucida.

Question 7

The membrane covering the acrosome contains receptors which bind to proteins of the zona pellucida. This binding triggers the ____, which causes the ____.

Answer 7

Acrosomal reaction;

Release of digestive enzymes.